804 REPORT UNITED STATES GEOLOGICAL SURVEY. 



Criocephalus productus Le Conte. (Plate LXX, Fig. 7.) 



Varying from dark brown to black brown ; unspotted, with two high, 

 thin, raised lines or ridges on each wing-cover. It is closely allied to 

 the eastern C. agrestis, but is somewhat narrower, and the ridges are 

 much more prominent. Length, 0.80-0.85 inch. 



Dectes spinosus (Say). (Plate LXX, Fig. 8.) 



"Head deeply indented between the antennoB; labrumpiceous; antennae 

 longer than the body, black, each joint gray at base ; thorax cylindrical, 

 immaculate ; an acute, slightly-recurved spine near the posterior angles; 

 elytra (wing-covers) with numerous small impressed punctures, at tip trun- 

 cated ; venter with a series of almost concealed black spots on each side. 

 Length more than three-tenths of an inch." — (Say.) "1 formed a special 

 genus, Dectes, for this insect, but it seems to be scarcely distinct from 

 Liopus.^^ — (Le Conte.) 



PoGONOCHERUS MiXTTJS Haldeman. (Plate LXX, Fig. 9.) 



"Head sparsely hairy, black, with an indistinct yellowish spot before 

 the eyes; frontal line impressed; antennae testaceous, with the tip of 

 the articulations blackish ; scutel black ; elytra hispid ; base, middle, 

 and apex brown ; extreme tip and an oblique band before the middle 

 running forward and outward, yellowish, with a few brown dots ; ex- 

 treme base testaceous; feet brown, varied with testaceous; 2^ lines 

 long. Pennsylvania." — (Haldeman.) 



Mecas pergrata Say. (Plate LXX, Fig. 10.) 



" Body black, covered with short, prostrate hair, which partially con- 

 ceals the punctures; antennae nearly as long as the body, annulate with 

 cinereous and black ; thorax slightly dilated in the middle ; a trans- 

 verse, arcuated series of four glabrous spots, and a longitudinal, ab- 

 breviated, glabrous line behind the middle ; scutel whitish ; elytra with 

 a narrow white margin and suture ; tip entire ; thighs dull rufous. 

 Length about nine- twentieths of an inch. Upon the middle of each 

 elytron is a very indistinct rufous line, which is only visible upon close 

 inspection, and is very probably often wanting; a similar spot is upon 

 the anterior portion of the thorax ; the white appearance of the margin 

 of the elytra is occasioned by the more dense disposition of the hairs on 

 that part. We captured but a single specimen on the Platte Eiver (Ne- 

 braska) near the mountains." — (Say.) 



Chrysobothris trinervia (Kirby). (Plate LXX, Fig. 11.) 



A rather small, short, broad species, dull blackish, with faint, metal- 

 lic reflections. Surface of the body, especially the wing-covers, with 

 irregular ridges, the inner one parallel to the inner edge of the wing- 

 cover; wing-covers with smooth elevated areas, between which the 

 surface is minutely pitted with dense golden punctures. Body clothed 

 beneath with short, coarse hairs. Length, 0.45 inch. 



BuPRESTis RUSTicoRUM Kirby. (Plate LXX, Fig. 12.) 



Body brown, with an olive-green tint. Head and thorax punctured. 

 Each wing-cover with five ridges, four of them well-marked and smooth, 



